Anchoring device for casing procedures in well bores

A device for anchoring a tubing of the type employed for casing a well bore, the device being combined with a tool string employed for installing the tubing into the well bore, the device comprising:

• an anchor body in said tubing;
• a plurality of anchoring fingers pivotally mounted in said anchor body for moving between a retracted position wherein the fingers are aligned closed to the body and an extended position wherein the fingers extend transversely out of the body,
• a fingers-carrying assembly for keeping the fingers in said retracted position, wherein the fingers-carrying assembly is mounted in the anchor body and is capable of moving along the anchor body from a resting position, wherein the fingers are kept in the retracted position, to a releasing position, wherein the fingers are released to move to the extended position,
• breakable pins for retaining the fingers-carrying assembly in a resting position wherein the fingers are in their retracted position,
• the anchor body including a guiding sleeve mounted inside the anchor body and retained by the breakable pins in a resting position together with the fingers-carrying assembly,
• the guiding sleeve being a tubular sleeve defining a fluid circulation conduit having an upper end with a sealing seat and a lower end,
• a sealing ball piece being mounted in a manner that the ball may seat in the sealing seat and when the ball piece is seated against the sealing seat the circulation of fluid through the fluid circulation conduit is interrupted,
• wherein said pins for retaining the guiding sleeve being mounted at the lower end of the conduit, and
• wherein the guiding sleeve is fixed to a projecting ring forming a stop for a compression ring and mounted between said projecting ring and a fingers carrying sleeve.